This is what I get: https://imgur.com/a/aHy0c0Z

Would love to try it!

Thanks. I just double checked on High Sierra and I'm not seeing the problem but I don't have a Mojave install in front of me right now so I can't troubleshoot it immediately.

Are you seeing that problem when opening the DMG or the app itself? Does it help to use the right-click-and-choose-open approach?

For what it is worth you can download (a zipped version of) the .app file directly from https://www.fatpick.com/releases/FATpick-1.3.5-mac.zip, if that would work around the problem.

Is the app both signed (and notarized)? - if not you will have to CTRL + Right click -> open to run the unsigned code.

It is signed with a valid developer ID associated with the same LLC mentioned on the site (and that owns the domain), so you can be reasonably certain that the app you are running is the one that we (I) created.

It is not yet notarized, but only because of my own ignorance of the implications of that. (In my defense the notarization thing is a relatively new policy.)

basically it is just:

   xcrun altool --notarize-app --primary-bundle-id "com.your.bundleid" --username "username" --password "password" --file "/path/to/installbundle"

read the doc here [1]

Wait for apple to approve it.

Then staple it.

[1] https://developer.apple.com/documentation/security/notarizin...

Thank you. I appreciate that you took the time to post that.

It's when attempting to run the app.